#!/bin/bash
# Author:  yeho <lj2007331 AT gmail.com>
# BLOG:  https://linuxeye.com
#

export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
export LANG=en_US.UTF-8
clear
printf "
#######################################################################
#                             Auto fdisk                              #
#######################################################################
"
# Check if user is root
[ $(id -u) != "0" ] && { echo "${CFAILURE}Error: You must be root to run this script${CEND}"; exit 1; }

current_dir=$(dirname "$(readlink -f $0)")
pushd "${current_dir}" > /dev/null || exit

echo=echo
for cmd in echo /bin/echo; do
    $cmd >/dev/null 2>&1 || continue
    if ! $cmd -e "" | grep -qE '^-e'; then
        echo=$cmd
        break
    fi
done
CSI=$($echo -e "\033[")
CEND="${CSI}0m"
CDGREEN="${CSI}32m"
CRED="${CSI}1;31m"
CGREEN="${CSI}1;32m"
CYELLOW="${CSI}1;33m"
CBLUE="${CSI}1;34m"
CMAGENTA="${CSI}1;35m"
CCYAN="${CSI}1;36m"
CSUCCESS="$CDGREEN"
CFAILURE="$CRED"
CQUESTION="$CMAGENTA"
CWARNING="$CYELLOW"
CMSG="$CCYAN"

get_char() {
    SAVEDSTTY=$(stty -g)
    stty -echo
    stty cbreak
    dd if=/dev/tty bs=1 count=1 2> /dev/null
    stty -raw
    stty echo
    stty $SAVEDSTTY
}

MOUNT_DIR=/data
FSTAB_FILE=/etc/fstab

count=0
TMP1=/tmp/.tmp1
TMP2=/tmp/.tmp2

> $TMP1
> $TMP2

# check lock file, one time only let the script run one time
LOCKfile=/tmp/.$(basename $0)
if [ -f "$LOCKfile" ];then
    echo
    echo "${CWARNING}The script is already exist, please next time to run this script${CEND}"
    echo
    exit
else
    echo
    echo "${CMSG}Step 1.No lock file, begin to create lock file and continue${CEND}"
    echo
    touch $LOCKfile
fi

# check disk partition
check_disk() {
    > $LOCKfile
    for i in $(fdisk -l | grep -oE 'Disk /dev/x?[sv]d[b-z]' | awk '{print $2}')
    do
        if [ -z "$(blkid | grep -v 'PTTYPE="dos"' | grep -w "$i")" ];then
            if [ -z "$(mount | grep "$i")" -a ! -e "${i}1" ]; then
                echo $i >> $LOCKfile
                echo "You have a free disk, Now will fdisk it and mount it"
            fi
            if [ -z "$(mount | grep "$i")" -a -e "${i}1" ]; then
                echo "${CWARNING}The $i has been partitioned! ${CEND}"
                while :; do echo
                    read -e -p "Do you want to reformat the partition? [y/n]: " reformat_yn
                    if [[ ! ${reformat_yn} =~ ^[y,n]$ ]]; then
                        echo "${CWARNING}input error! Please only input 'y' or 'n'${CEND}"
                    else
                        if [ "${reformat_yn}" == 'y' ]; then
                            echo "${CWARNING}You will format $i, Please backup the data in ${i}! ${CEND}"
                            echo "Press Ctrl+c to cancel or Press any key to continue..."
                            char=$(get_char)
                            dd if=/dev/zero of=$i bs=512 count=1 &>/dev/null
                            echo $i >> $LOCKfile
                        fi
                        break
                    fi
                done
            fi
        fi
    done
    DISK_LIST=$(cat $LOCKfile)
    if [ "X$DISK_LIST" == "X" ];then
        echo
        echo "${CWARNING}No free disk need to be fdisk. Exit script${CEND}"
        echo
        rm -rf $LOCKfile
        exit 0
    else
        echo "${CMSG}This system have free disk :${CEND}"
        for i in $(echo $DISK_LIST)
        do
            echo "$i"
            count=$((count+1))
        done
        [ $count -gt 1 ] && { echo "${CWARNING}This system has at least two free disk, You must manually mount it${CEND}"; exit 0; }
    fi
}

# check os
check_os() {
    os_release=$(grep "Aliyun Linux release" /etc/issue 2>/dev/null)
    os_release_2=$(grep "Aliyun Linux release" /etc/aliyun-release 2>/dev/null)
    if [ "$os_release" ] && [ "$os_release_2" ];then
        if echo "$os_release" | grep "release 5" >/dev/null 2>&1;then
            os_release=aliyun5
            modify_env
        fi
    fi
}

# install ext4
modify_env() {
    modprobe ext4
    yum -y install e4fsprogs
}

# fdisk ,formating and create the file system
fdisk_fun() {
fdisk -S 56 $1 << EOF
n
p
1


wq
EOF
    
    sleep 5
    mkfs.ext4 ${1}1
}

# make directory
make_dir() {
    echo "${CMSG}Step 4.Begin to make directory${CEND}"
    while :; do echo
        read -e -p "Please enter a location to mount (Default directory: /data): " MOUNT_DIR
        [ -z "$MOUNT_DIR" ] && MOUNT_DIR=/data
        if [ -z "$(echo $MOUNT_DIR | grep '^/')" ]; then
            echo "${CWARNING}input error! The directory must begin with / ${CEND}"
        else
            break
        fi
    done
    [ ! -e "$MOUNT_DIR" ] && mkdir -p "$MOUNT_DIR"
    mkdir -p "$MOUNT_DIR"
    echo "$MOUNT_DIR" >> $TMP1
}

# config /etc/fstab and mount device
main() {
    for i in $(echo $DISK_LIST)
    do
        echo
        echo "${CMSG}Step 3.Begin to fdisk free disk${CEND}"
        [ -n "$(mount | grep ${i}1)" ] && { echo "${CFAILURE}The ${i}1 already mount${CEND}"; echo; exit 0; }
        fdisk_fun $i > /dev/null 2>&1
        echo
        echo "${i}1" >> $TMP2
    done
    make_dir
    > $LOCKfile
    paste $TMP2 $TMP1 > $LOCKfile
    echo
    echo "${CMSG}Step 5.Begin to write configuration to /etc/fstab and mount device${CEND}"
    while read a b
    do
        Dline=$(grep -n ^${a} /etc/fstab | awk -F: '{print $1}')
        [ -n "$Dline" ] && sed -i "${Dline}d" $FSTAB_FILE
        echo "${a}	$b	ext4	defaults	0 0" >> $FSTAB_FILE
    done < $LOCKfile
    mount -a
    echo
}

# start script
echo "${CMSG}Step 2.Begin to check free disk${CEND}"
#service mysqld stop
#mv /data /root
check_os
check_disk
main
df -h
#mv /root/data/* /data
#service mysqld start
rm -rf $LOCKfile $TMP1 $TMP2